I'm a noob here, but when I'm dealing with several small sprites that are very similar (like button states) I find I have to click the images in the selector in turn, and watch the name field elsewhere, to check that I have clicked the correct one. Then I have to return to the selector to close it with the red cross. It's a
little bit of a faff

Having the sprite names shown in the sprite selector (underneath or alongside each icon), and having the sprite selector auto-dismiss on select or after double-clicking a sprite would be perfect IMO.
Still, I've not worked on any big projects yet, so I don't want to preach as to how it should be done! Just my thoughts...